Physical Characteristics. Wakulla County is in north Florida and is bordered by the Gulf of Mexico, and by Franklin, Liberty, Leon, and Jefferson counties. The county has 601.32 square miles of land and 34.40 square miles of water for a total of 635.72 square miles. The average January temperature is 54.2 degrees fahrenheit, and the average August temperature is 81.4 degrees fahrenheit. The average annual rainfall is 54.03 inches. History. Wakulla County was established from a portion of Leon County in 1843. Wakulla, also the name of the enormous spring and river in the county, is probably of Indian derivation. It may contain the word Kala, meaning "spring of water" in some Indian dialects or wahkola, meaning "loon" in Hitchiti, a language of the Creek Indians.